Randomized cyclic delay code for cooperative communication systems |
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Authors: | Seungwon Choi Jung-Hyun Park Dong-Jo Park |
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Affiliation: | Korea Adv. Inst. of Sci. & Technol., Daejeon; |
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Abstract: | We deal here with distributed cooperative communication systems in which a single source transmits its information with the help of multiple relays to a destination. Specifically, we consider decode and forward relay networks based on orthogonal frequency division multiplexing (OFDM). Most previous work needs a priori information for antenna allocation to obtain cooperative diversity advantages. We propose a simple method that does not require additional information in order to coordinate relay transmission. Our main proposal is to retransmit randomly cyclic-shifted sequences of the received symbol at relays. Simulation results verify that full gain in diversity is achieved when the number of subcarriers is sufficiently large. |
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